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 Post subject: Identify parts for a1936 Bosch 602T but can't read schematic
PostPosted: Oct Thu 11, 2018 6:58 pm 
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Joined: Oct Mon 01, 2018 9:16 pm
Posts: 47
Location: Limerick, PA
The schematics I have for the 1936 American Bosch 602T are really bad. I can't read the parts. I replaced the capacitors that needed to be replaced and identified the tubes, resistors and most of the other parts.
There are a couple of variable capacitors that I just can't make out. They have some rust on them and will probably need replaced.

The most important part is variable capacitor C68 on the front. Other parts are variable capacitors 1, 2, 3, 12, 13, 14. Volume control #39 VR9540 and Tone control #54 VR9539.

Thanks. If anyone has readable schematics to share that would great.

David


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 Post subject: Re: Need parts for a 1936 Bosch 602T but can't read schemati
PostPosted: Oct Thu 11, 2018 7:46 pm 
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Joined: Nov Mon 06, 2017 7:45 pm
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Location: Sherwood, Oregon
Are you using the schematics for model 602 (not 602T)? Besides the rust - why do you think they need to be replaced?
You can get a pretty legible schematic here: https://www.americanradiohistory.com/Archive-Rider/37/Rider-1937-STU.pdf
Page 210 (United American Bosch).
Rust can be removed with Naval Jelly. Just dab some on and let it sit for awhile, then clean/scrape it off.


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 Post subject: Re: Need parts for a 1936 Bosch 602T but can't read schemati
PostPosted: Oct Thu 11, 2018 8:48 pm 
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Joined: Oct Mon 01, 2018 9:16 pm
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Location: Limerick, PA
Thanks, that's a little more readable. The other one's were from radiomuseum.
I think that capacitor says "LAG COND 350 - 700" Part # CS0560
I have a 602T. On the Alignment Notes it says it's the same as 602 except the following parts...

There is rust on the front of the chassis. I can't imagine there is anything left of the variable capacitor. I'm going to have to cut the screws out.

I never had much luck with naval jelly


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 Post subject: Re: Need parts for a 1936 Bosch 602T but can't read schemati
PostPosted: Oct Thu 11, 2018 9:17 pm 
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Location: Mountains of Mourne. Ireland.
Didn't you read this?
viewtopic.php?p=2919458#p2919458

All 602T parts + their values given in high-resolution.
Greg.


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 Post subject: Re: Need parts for a 1936 Bosch 602T but can't read schemati
PostPosted: Oct Fri 12, 2018 4:39 am 
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Location: Sherwood, Oregon
Brickhouse wrote:
Thanks, that's a little more readable. The other one's were from radiomuseum.
I think that capacitor says "LAG COND 350 - 700" Part # CS0560
I have a 602T. On the Alignment Notes it says it's the same as 602 except the following parts...

There is rust on the front of the chassis. I can't imagine there is anything left of the variable capacitor. I'm going to have to cut the screws out.

I never had much luck with naval jelly


I just checked my Riders Vol. 7. You are correct.


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 Post subject: Re: Need parts for a 1936 Bosch 602T but can't read schemati
PostPosted: Oct Fri 12, 2018 11:19 am 
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Location: Annapolis, MD
Quote:
I never had much luck with Naval Jelly


Naval Jelly is totally predictable. For serious rust, it is simply very slow and tedious.
First, scrape or wire brush to remove as much loose stuff as possible. Then apply NJ and WAIT. If the rust is really bad, wait until it dries completely, then wire brush it off and reapply. When things start to clean up, then use the directions to wash it off with water before it dries.
If there is major pitting, you may have to repeat the process many times.

_________________
-Mark http://pixellany.com

"It's always something". --Gilda Radner (1946 - 1989)


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 Post subject: Re: Need parts for a 1936 Bosch 602T but can't read schemati
PostPosted: Oct Fri 12, 2018 9:22 pm 
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Joined: Oct Mon 01, 2018 9:16 pm
Posts: 47
Location: Limerick, PA
That helps A LOT! Thanks Greg. They asked for a log in and I figured I was going to get the same schematic I already had.

I guess I don't have a lot of patience with Navel Jelly. I used a wire brush and made it look good with scratch remover.


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